Red Bull are considering manufacturing their own engines after 2015 - but have confirmed they will continue to use Renault power next year.Red Bull have won all of their previous eight titles in partnership the French company but have been left behind by Mercedes at the start of the sport's new hybrid era largely because of the inadequacies of the Renault V6 power-unit. According to Red Bull boss Christian Horner, who has made plain his frustration with Renault since the start of winter testing when the RB10 was beset by reliability woes, the Renault power-pack is around 30 horsepower shy of Mercedes' field-leading engine. "We will have a look at where the engine is standing after this...
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